What would cause a red rash to come out on your skin like face?

Several factors can cause a red rash on your skin, including:

1. Allergic Reactions: Certain allergens like food items (nuts, shellfish), medications, insect bites/stings, latex, or even plants can trigger an allergic reaction, leading to a red, itchy rash.

2. Infectious Causes: Viral infections such as measles, chickenpox, rubella, and viral exanthems, and bacterial infections like scarlet fever and streptococcal infections can cause red rashes.

3. Fungal Infections: Ringworm and athlete's foot are fungal infections that can result in red, itchy rashes on the skin.

4. Skin Conditions: Eczema (atopic dermatitis), psoriasis, rosacea, and contact dermatitis are skin disorders characterized by red rashes and inflammation.

5. Heat-Related Conditions: Heat rashes and sunburns can lead to red, irritated rashes on the skin.

6. Drug Reactions: Certain medications can cause red rashes as a side effect.

7. Autoimmune Disorders: Some autoimmune diseases, like lupus and rheumatoid arthritis, can manifest as red rashes.

8. Infections: Infections such as impetigo, cellulitis, and shingles can cause red rashes.

9. Irritants: Contact with irritants like chemicals, soaps, fragrances, or even fabrics can cause red rashes on the skin.

10. Insect Bites/Stings: Bites from insects like mosquitoes, fleas, or spiders, or stings from bees and wasps can cause red, itchy rashes.

If you develop a red rash suddenly and it's accompanied by other symptoms like fever, shortness of breath, or confusion, seek immediate medical attention. In most cases, red rashes resolve on their own within a few days, but if it persists, it's essential to consult a dermatologist for proper diagnosis and treatment.